Behind the ear hearing aid device



FIG. 1 is a perspective view of the behind the ear hearing aid device;

FIG. 2 is a right side view thereof, the left side view being substantially a mirror image;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a behind the ear hearing aid device, as shown and described. 